Shadow the Hedgehog (シャドウ・ザ・ヘッジホッグ, Shadou za Hejjihoggu) is a character from the Sonic the Hedgehog series who, like Knuckles, has a bit of a rivalry with Sonic. He is known as the "Ultimate Lifeform." He has his own game that mainly features him, the self-titled Shadow the Hedgehog, which was released in 2005 for all three sixth-generation consoles.
Shadow appears as an unlockable Assist Trophy and uses his Chaos Control ability to slow down everyone except the summoner (Similar to the Timer or Luigi's Negative Zone, though with a shorter duration). Shadow's AT is unlocked when the player unlocks Sonic. He also appears as a regular Trophy.
Shadow The Hedgehog is a black hedgehog who resembles Sonic. He was created by Dr. Eggman's grandfather, Gerald Robotnik, to be the ultimate life-form. Not only does he look like Sonic, but he has equal abilities. He has great skill with the space-time warping technique called Chaos Control. To reach his goals, he'll use any means necessary.
Sonic Adventure 2